Sophiiiiiiiiiiiiiiiieeeeeeeeeeeeeesss... This isn't a Generation V threeeeeaaaaad! To answer your question anyway, I really don't know; I don't own any of the Generation V games. Serebii says nothing about what time of the day it needs to be, at least:
http://www.serebii.net/blackwhite/legendary.shtml
I've also looked on YouTube; apparently, you didn't forget anything. I don't know what to say...
And... Cool Items Bro? The Box Trick isn't working? Huh... That's concerning... I wish I could help you with that, but this is all I could find, and it says the Box Trick is your only option. Sorry, bro.
http://www.psypokes.com/lab/evguide.php
Can you still EV-train when your Pokemon is at level 100?
Yes you can, but since the Pokemon can no longer level up, the stat will never increase due to EVs gained. How then, can one overcome this problem? The answer lies in the Box Trick. Suppose your Mewtwo gains 4 Speed EVs. To increase its Speed by 1, deposit Mewtwo in the PC, and withdraw it again. Its Speed will now be higher by 1 point. This is because the stats are recalculated each time you withdraw a Pokemon in the PC. However, this is a tedious process. You will have to repeat this procedure for every 4 EVs gained. As such, it is advisable to start EV training early so that you do not have to resort to this means to let your level 100 Pokemon gain stats.
I also checked Bulbapedia; it had little to add...
Lv 100 Pokemon
Sigh.. my brother wanted to make a Latias he got stronger. The Latias was Lv100, so he gave the berries that lower EVs in ATTACK, so he could give extra Sp.Atk to his Latias, but when he went to train, the Latias did NOT receive any EV after battling (he tried doing the box trick so the game would recalculate the EVs, but the Sp.Atk didn't rise). So here is the question: Can a Lv 100 Pokemon receive EVs? hfc2X 18:21, 18 May 2008 (UTC)
No, you can't EV train at 100. Tina☆♫ 18:29, 18 May 2008 (UTC)
What about in Generation III? I've heard many conflicting stories about Level 100 Pokémon in Generation III receiving/not receiving experience and EVs. Ultraflame 02:16, 19 May 2008 (UTC)
I'm positive that without actually leveling up, the Pokémon won't gain any EVs. I believe the previous versions allowed players to deposit a Pokémon into a storage box, then withdraw, which would re-count the EVs... but this isn't in Gen.III, I'm 99% sure. -- Jïörüjï Ðērākō.>.cнаt^ 03:52, 19 May 2008 (UTC)
And what about pokémon that I already use vitamins? I mean because if you use medicine on them until it gets to "It won't have any effect", can you still train them? hfc2X 19:53, 20 May 2008 (UTC)
Vitamins cap out at 100 EVs (10 EVs per item), so when the Vitamins stop working, there's still 155 EVs left that you can do in that stat.
In Gen.IV at least, I know Vitamins won't actually help you out training a level 100 Pokémon, if that's your question, since Vitamins grant EVs, and you'll need to level up to gain the effects. Just an FYI. -- Jïörüjï Ðērākō.>.cнаt^ 09:41, 21 May 2008 (UTC)
Eheh, he tried the box trick? That's only in the original Game Boys, not the Advance. So the trick won't work: 0.00000000000001% chance of it working. Good luck. Posted by the Θρtιmαtum
Talk|Links09:45 21 May 2008
If this is any evidence for or against the idea, I once made a mistake in EV training my Donphan--It was Level 50 with 196/140 HP/Attack instead of the 197/141 I wanted. I deleted its EVs, re-trained it WITHOUT LEVELLING IT UP, and deposited it into the PC. Donphan is still Level 50 and now has 197/141 HP/Attack. Ultraflame 22:16, 21 May 2008 (UTC)
Which game were you playing exactly? -- Jïörüjï Ðērākō.>.cнаt^ 05:09, 22 May 2008 (UTC)
Sorry. It was Diamond. Ultraflame 22:46, 22 May 2008 (UTC)
The box trick works in Gen III too. I've done it many times, but just for fun because I know it's the same as leveling up. But I was wondering if you could do it with lv 100 pokemon too, because it's still possible with other pokemon. hfc2X 00:48, 23 May 2008 (UTC)
Also, no one's answering my question! Is it just that bad of a team it doesn't deserve any respect? I'm insulted! :P